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is a significant concern for physicians. Central% t h0 L) }2 Q: \7 h
precocious puberty (CPP), which is mediated; ]; y0 H, \; r0 s. i/ k0 f
through the hypothalamic pituitary gonadal axis, has1 f( |' g3 G$ d0 F/ ?/ b7 L9 G
a higher incidence of organic central nervous system
' I3 f. p% p# g6 S2 K+ t) E# P$ ilesions in boys.1,2 Virilization in boys, as manifested
; u5 z8 M1 ^* d$ r9 e, dby enlargement of the penis, development of pubic
Z8 `; E5 \6 `( Zhair, and facial acne without enlargement of testi-+ A2 H- s7 D a) ^& ?
cles, suggests peripheral or pseudopuberty.1-3 We
8 y& W* z9 b6 G( q+ Treport a 16-month-old boy who presented with the8 Q2 I' A! f3 k7 B- ^
enlargement of the phallus and pubic hair develop-9 {7 B7 }; S* E
ment without testicular enlargement, which was due
( Z5 E1 @" K3 @0 Yto the unintentional exposure to androgen gel used by, ]+ I' ^5 I+ i2 H2 `. |$ j7 Y) a
the father. The family initially concealed this infor-# M4 u' w* D2 M+ j, v
mation, resulting in an extensive work-up for this
0 m* }+ k' q. m7 f+ g5 B Wchild. Given the widespread and easy availability of
/ a+ ~. N5 o8 h' ^/ dtestosterone gel and cream, we believe this is proba-3 j9 \% E, b* m( q5 ~! I6 u' }$ ?8 w
bly more common than the rare case report in the
8 v% N5 E3 n6 a4 L" @! Wliterature.4
! y u6 G# w7 Q" t- V8 f* f' p9 zPatient Report& B( v# [* a# ~: o. y0 t
A 16-month-old white child was referred to the
' y4 p* h& w# M& Jendocrine clinic by his pediatrician with the concern6 I# U8 A% X, k" u
of early sexual development. His mother noticed
' q2 l ~7 i" V- c; [light colored pubic hair development when he was
% |5 R: Z! U0 m6 k' r! UFrom the 1Division of Pediatric Endocrinology, 2University of" ], A7 }7 M4 \& V' B6 w
South Alabama Medical Center, Mobile, Alabama.+ {1 \- N' v' | T/ ]! g- r
Address correspondence to: Samar K. Bhowmick, MD, FACE,
& i; \/ D: ?: ]) l9 z0 f; ^! {Professor of Pediatrics, University of South Alabama, College of; v1 q& m5 u' \: m% Q$ a
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
. k. i- _+ B1 Q$ u4 E1 Qe-mail: [email protected].9 z/ O$ ~" U* t% a! u) J% {
about 6 to 7 months old, which progressively became
' w. ~, `) d& w9 B3 w5 ]darker. She was also concerned about the enlarge-- S% W: S4 P ?! j/ Y
ment of his penis and frequent erections. The child5 y0 S! o7 ]' _# \
was the product of a full-term normal delivery, with
! p# u. _: L' p$ D0 `! Q3 t# Oa birth weight of 7 lb 14 oz, and birth length of
0 }0 L E; B" W2 X7 I$ ]$ e20 inches. He was breast-fed throughout the first year
, c8 s+ n- n8 X" Y5 p \8 N* u5 lof life and was still receiving breast milk along with: \2 r+ w0 P% K$ L: V
solid food. He had no hospitalizations or surgery,
* v7 X+ D/ \0 c( L0 ~& v7 O5 V, o. W+ rand his psychosocial and psychomotor development6 m$ c' i! P, h
was age appropriate.
) g% t0 R7 r, B. }The family history was remarkable for the father,
7 x) C5 F( h1 W" [- Mwho was diagnosed with hypothyroidism at age 16,
" t% B- c2 I( Q3 I% Q/ Uwhich was treated with thyroxine. The father’s
$ B5 C2 d! k' y7 i) L( E6 zheight was 6 feet, and he went through a somewhat
' w; B: F G4 I8 w% A mearly puberty and had stopped growing by age 14.+ A& n- m; b4 ?0 }1 J0 T
The father denied taking any other medication. The
' P. m& d" u M& w0 @6 o& zchild’s mother was in good health. Her menarche: p( ?5 w+ `' j
was at 11 years of age, and her height was at 5 feet
- o3 { E2 @/ h2 ]2 T5 inches. There was no other family history of pre-
5 C" P& a" R4 [: acocious sexual development in the first-degree rela-
0 W, i+ o8 U) b9 Ztives. There were no siblings.
' w6 B# u7 H5 o; {Physical Examination
, Y D% _3 k3 Y \" i0 DThe physical examination revealed a very active,
& i' w. n6 n. @playful, and healthy boy. The vital signs documented
2 }1 Y3 l" K: w5 K, W5 t. }8 x' n% y) Ia blood pressure of 85/50 mm Hg, his length was8 A2 R8 F2 S4 a+ ?# a- F
90 cm (>97th percentile), and his weight was 14.4 kg
8 b. F& }7 F. ^9 J9 {(also >97th percentile). The observed yearly growth. g: z" ?5 i8 M- @$ e6 y- f/ Z F- h& j
velocity was 30 cm (12 inches). The examination of
+ }3 S% [7 A2 m+ D8 ^# n" I$ w9 Mthe neck revealed no thyroid enlargement.2 S7 m, ]- S& j8 {6 w3 T' Y1 Z
The genitourinary examination was remarkable for
- j% F: E. F3 Z9 f- renlargement of the penis, with a stretched length of
5 E. T+ x& K9 ]& |8 cm and a width of 2 cm. The glans penis was very well' V7 c5 O5 H8 {+ M. U+ m/ Z1 L$ d
developed. The pubic hair was Tanner II, mostly around- Y$ o) C/ K' m" E8 F9 {
540
' U' V+ L9 i1 J0 d* T2 ?' ^at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
) A3 r! f+ I! ?2 t+ w& jthe base of the phallus and was dark and curled. The% C8 |$ j$ B1 A3 N" B! l0 ~5 ?
testicular volume was prepubertal at 2 mL each.
7 X* B' W2 c+ u$ n' ?The skin was moist and smooth and somewhat' L2 W# ^& {3 j4 [$ V
oily. No axillary hair was noted. There were no
. _. x4 M* B6 j+ F1 j7 E% zabnormal skin pigmentations or café-au-lait spots.5 k M+ m% {$ |- J6 H9 D
Neurologic evaluation showed deep tendon reflex 2+
) Y' F. Q$ c5 @' k( C+ {, Pbilateral and symmetrical. There was no suggestion0 Z! P) R$ M, [$ ^4 i O* @0 L
of papilledema.5 @4 A, m) g, ~ i& w
Laboratory Evaluation. T* h/ z, N% r
The bone age was consistent with 28 months by
0 Z9 R" C& |/ K# Q. Fusing the standard of Greulich and Pyle at a chrono-
Y+ }/ f* k0 S% B# Blogic age of 16 months (advanced).5 Chromosomal* V7 W0 X. s% D H4 i( ^9 B
karyotype was 46XY. The thyroid function test
5 W4 h' s5 q2 K8 ?showed a free T4 of 1.69 ng/dL, and thyroid stimu-
* H2 c0 p6 h7 v1 r4 @, X" c* ?lating hormone level was 1.3 µIU/mL (both normal).
, `- ~/ j. J0 X9 V, vThe concentrations of serum electrolytes, blood6 ]( I' Q2 z4 r, `. i
urea nitrogen, creatinine, and calcium all were" ?& w% X' m0 R
within normal range for his age. The concentration
7 b# s; C0 o. b0 n; ^* zof serum 17-hydroxyprogesterone was 16 ng/dL
7 u/ X U8 j; y3 d- n9 F# C$ q- q/ A(normal, 3 to 90 ng/dL), androstenedione was 20- Z, V( Z) |$ d% ?$ K& G
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
& ^/ {, G- T5 N# W) a5 Yterone was 38 ng/dL (normal, 50 to 760 ng/dL),$ O' ]9 P( X/ r
desoxycorticosterone was 4.3 ng/dL (normal, 7 to* c# D4 \6 u5 n2 ]& G
49ng/dL), 11-desoxycortisol (specific compound S)
- { u O: ~4 T/ n# L2 t: w: T8 wwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-) P8 l1 p u& L3 {' k
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total' \$ L; @5 v+ f2 v
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
; e3 T8 H8 n/ Pand β-human chorionic gonadotropin was less than
" S* Y; c, Z% X5 mIU/mL (normal <5 mIU/mL). Serum follicular
3 J* P( x+ q- w0 j) m# M1 R* I! }stimulating hormone and leuteinizing hormone7 Z- x4 Q9 t8 S3 q
concentrations were less than 0.05 mIU/mL& k# K+ i+ Q6 B8 ?
(prepubertal).
3 U* M4 h R* E% C3 KThe parents were notified about the laboratory! x" d' U. u! o- c7 P
results and were informed that all of the tests were& l) ?& p# \5 v9 `" W8 o
normal except the testosterone level was high. The6 Z9 r) C# G- G' A Q+ M
follow-up visit was arranged within a few weeks to" c X- o! _4 [
obtain testicular and abdominal sonograms; how-" T$ ? c: Y! X5 ^6 M
ever, the family did not return for 4 months.
/ v5 t+ X8 w; g; L; k# R! aPhysical examination at this time revealed that the* V2 F, C0 c9 H8 `+ S' {
child had grown 2.5 cm in 4 months and had gained
2 ~# v8 K0 H8 }8 e) T# [& f2 kg of weight. Physical examination remained. U* q* b; P* m% R1 k- @ @
unchanged. Surprisingly, the pubic hair almost com-* V" W5 T# l# O
pletely disappeared except for a few vellous hairs at
3 u7 H* C; n5 ^+ Z% X2 M8 x) j& C* Nthe base of the phallus. Testicular volume was still 2( O i$ h; {& p: w) `5 a: W& n
mL, and the size of the penis remained unchanged.4 W1 Q+ t2 N5 y* K9 q
The mother also said that the boy was no longer hav-
, {; v" G5 i' Z; Ving frequent erections.
; R( ?2 i- ^: u$ C! g/ PBoth parents were again questioned about use of3 z T/ j0 i! j3 r; L+ O+ {2 ` a
any ointment/creams that they may have applied to9 C( g+ w, j* Y. O) g$ M6 J( z
the child’s skin. This time the father admitted the" N, V" _" x& q+ S2 O/ g2 u1 ]
Topical Testosterone Exposure / Bhowmick et al 541; K$ ] ]+ q! X+ Q0 f- F# D
use of testosterone gel twice daily that he was apply-2 a: C6 E W( @" W+ m
ing over his own shoulders, chest, and back area for
+ q6 b1 N/ C' J5 k) _a year. The father also revealed he was embarrassed* J( E) c! C* B" U3 m; G S
to disclose that he was using a testosterone gel pre-
- }( |: F' C1 S tscribed by his family physician for decreased libido
g3 B I. l) p; l& j' d2 asecondary to depression.' i# l9 P: J, ~ X7 s7 n8 s/ \
The child slept in the same bed with parents.1 d, R, q0 k& d2 M/ p/ B3 f9 A
The father would hug the baby and hold him on his0 O$ n: F# ]& N3 i1 G' T
chest for a considerable period of time, causing sig-4 h: O( B+ T1 D5 }5 ~ ~
nificant bare skin contact between baby and father." ~9 w t W8 |, X
The father also admitted that after the phone call,/ j* P% b* a7 L/ m$ H
when he learned the testosterone level in the baby* N% }! [0 z+ S# i7 {( W4 \
was high, he then read the product information0 L/ }4 l1 O1 l2 r
packet and concluded that it was most likely the rea-
2 }( @0 V' e4 L* t J1 Hson for the child’s virilization. At that time, they( B2 I( D, y9 N) H% p
decided to put the baby in a separate bed, and the
6 E+ e, G- x" }- o! ]: R: Jfather was not hugging him with bare skin and had7 C+ G' ~) Z6 L7 D! O7 \5 h& m" Z
been using protective clothing. A repeat testosterone& R6 j4 s% X8 F- v4 g
test was ordered, but the family did not go to the
2 O% { V: f% `3 x" a, K/ A. p. Claboratory to obtain the test.; L" S* }8 \* d
Discussion
( g# K' B( ~( Z, X2 I* V+ ^Precocious puberty in boys is defined as secondary
v$ `7 N4 a% H1 lsexual development before 9 years of age.1,4$ H6 A4 k0 g+ Y9 \6 z! X L% v
Precocious puberty is termed as central (true) when
! B' z! }0 r3 Y8 H7 }8 uit is caused by the premature activation of hypo-4 c; J { c( ]/ v$ v8 A E% v
thalamic pituitary gonadal axis. CPP is more com-( ]: u: U0 X4 h) ~3 n
mon in girls than in boys.1,3 Most boys with CPP, f- D6 {4 q3 A; F7 l* E1 l: ?# t! e
may have a central nervous system lesion that is
4 P2 {+ I1 {( Q1 Jresponsible for the early activation of the hypothal-
( K6 c# N/ j3 }, G' Damic pituitary gonadal axis.1-3 Thus, greater empha-. `' v% H) R+ `8 \6 [
sis has been given to neuroradiologic imaging in
# M1 ^, r5 q+ ~5 g! w: }/ n( h) yboys with precocious puberty. In addition to viril-6 S3 O9 G# |$ q4 F' r. R! l+ U
ization, the clinical hallmark of CPP is the symmet-
7 w+ s2 f. U& S. ^% prical testicular growth secondary to stimulation by/ j1 ]0 b7 x- E; ]
gonadotropins.1,3( H4 }* N$ g. ?5 ^7 J& k
Gonadotropin-independent peripheral preco-! n* z$ t3 D& j6 _* F# p
cious puberty in boys also results from inappropriate
. H( f% R5 b& ^: m* h# e' |( Dandrogenic stimulation from either endogenous or
& q+ h7 S/ N+ {/ \exogenous sources, nonpituitary gonadotropin stim-) X1 I& L) q6 m# r" g7 y
ulation, and rare activating mutations.3 Virilizing
7 P3 Q* f& i0 Zcongenital adrenal hyperplasia producing excessive
$ P, p9 C) N$ }- r6 {adrenal androgens is a common cause of precocious0 m u% b9 K7 ~
puberty in boys.3,4
6 L5 s* m% K( [/ \) vThe most common form of congenital adrenal
3 A2 A7 Z' `( Nhyperplasia is the 21-hydroxylase enzyme deficiency.
" r- B& W1 ^4 J$ t: \$ ^) j+ lThe 11-β hydroxylase deficiency may also result in
; }2 Q: _0 c* y8 o" Fexcessive adrenal androgen production, and rarely,
5 Y, t( ]4 G; qan adrenal tumor may also cause adrenal androgen5 `2 U' P2 V" Q+ l3 j' Y% Z
excess.1,3
0 \4 @/ m- _! x: l T0 E; Qat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from) b& K, b7 z, j, f7 U
542 Clinical Pediatrics / Vol. 46, No. 6, July 20079 h* S8 \5 ]) A$ r4 T8 l2 k
A unique entity of male-limited gonadotropin-
k* ^4 G7 z# a, |, e7 e; _independent precocious puberty, which is also known9 [8 Z4 @; y; h* ]- ~8 u8 O. w
as testotoxicosis, may cause precocious puberty at a! Z+ k6 ~' V0 x) t+ [6 t/ C( v
very young age. The physical findings in these boys
9 N/ x# c1 W9 Dwith this disorder are full pubertal development,
* s. y" A/ U$ X8 L# yincluding bilateral testicular growth, similar to boys$ u8 n% H8 m# J( `
with CPP. The gonadotropin levels in this disorder3 l9 m6 b' s0 h4 r2 h/ v/ M( l+ }
are suppressed to prepubertal levels and do not show3 b g1 ?5 z) U _6 R; K9 ]+ g1 C. o& F
pubertal response of gonadotropin after gonadotropin-
" K1 u5 R7 \ @! J2 ^releasing hormone stimulation. This is a sex-linked9 _. |/ U# D* P7 a; S
autosomal dominant disorder that affects only' L0 S- O; E3 N, l: t3 i% x, B
males; therefore, other male members of the family
5 U% I; R0 ]) }/ d9 b& J6 ]2 o! @ lmay have similar precocious puberty.3- {, ?' y p" N; q ]! z
In our patient, physical examination was incon-( f$ c% s4 o( r/ _$ ?6 ^( u
sistent with true precocious puberty since his testi-
5 ~" h3 ]! v7 N% ?7 C5 scles were prepubertal in size. However, testotoxicosis
% ^0 M4 d8 M4 q: Qwas in the differential diagnosis because his father
7 v& G( a/ O' K$ Z0 ]* U9 |% ~4 Z- pstarted puberty somewhat early, and occasionally,% q8 l. l# g$ \9 E
testicular enlargement is not that evident in the3 d% E6 ~& T' s
beginning of this process.1 In the absence of a neg-* ]2 D2 `8 Z& p* ]* u
ative initial history of androgen exposure, our
8 u' r! F: L4 i R5 i% ?biggest concern was virilizing adrenal hyperplasia,8 s, V, U( g. A. Z5 \' a9 G
either 21-hydroxylase deficiency or 11-β hydroxylase1 b$ |8 f# q1 F
deficiency. Those diagnoses were excluded by find-5 l+ Y0 |$ X- ]; k; O/ O
ing the normal level of adrenal steroids.0 G9 _% q1 ?# G5 u
The diagnosis of exogenous androgens was strongly& p3 g1 R$ `3 ?
suspected in a follow-up visit after 4 months because
! f; `, ~& {- g5 W0 L& p/ mthe physical examination revealed the complete disap-
; R5 Z% t0 ~4 C2 Zpearance of pubic hair, normal growth velocity, and
% k) q" c, @) Z9 \9 B& G7 odecreased erections. The father admitted using a testos-$ L4 I2 z2 @9 O- t
terone gel, which he concealed at first visit. He was
: }. w i3 K4 |1 i5 }4 n% c/ tusing it rather frequently, twice a day. The Physicians’
6 r8 A4 `' J5 R. U& ZDesk Reference, or package insert of this product, gel or
% N' a3 m) D1 mcream, cautions about dermal testosterone transfer to' o* G: ~8 G" w
unprotected females through direct skin exposure.
0 M( X" R( M( w* w& O LSerum testosterone level was found to be 2 times the
; B, I6 e8 P( z( L( f; `baseline value in those females who were exposed to5 l- |: f/ P7 N! B
even 15 minutes of direct skin contact with their male8 r; M) \8 }% o/ t- O
partners.6 However, when a shirt covered the applica-& g( q( I# c9 A" C& l. {
tion site, this testosterone transfer was prevented.
/ u4 Q; i+ A" V2 q* J* H; Z* N A1 |Our patient’s testosterone level was 60 ng/mL,3 M. r. h9 L7 J7 a0 x3 M
which was clearly high. Some studies suggest that
: n6 ^6 A! e+ edermal conversion of testosterone to dihydrotestos-% S8 U) k3 X, i* a- G- o r7 Y
terone, which is a more potent metabolite, is more) u7 Y/ [$ {4 \; \
active in young children exposed to testosterone7 `$ L2 U, \, G% n) J) B! L
exogenously7; however, we did not measure a dihy-
F: _! i1 g4 A& c! [. Cdrotestosterone level in our patient. In addition to0 A `$ Y0 Q& `/ U2 I4 L
virilization, exposure to exogenous testosterone in& s: }2 ^ o* R7 {4 T
children results in an increase in growth velocity and
* f& q5 y: q) N4 c y6 I) Q% Oadvanced bone age, as seen in our patient.& N P; r- K q% h
The long-term effect of androgen exposure during
( M) U9 b0 W% X- Nearly childhood on pubertal development and final
; k8 S5 r% O3 y9 madult height are not fully known and always remain% }. a) d6 g3 h# s# c. ?
a concern. Children treated with short-term testos-; G7 i- G% N. P% e' y7 a7 F
terone injection or topical androgen may exhibit some7 d, v! G+ {- P6 d* D
acceleration of the skeletal maturation; however, after
3 U; [1 N9 ?9 _' s" q+ P: T; C& Z4 qcessation of treatment, the rate of bone maturation
* d' j" e$ ]1 Edecelerates and gradually returns to normal.8,9
4 ?; S6 g- \, DThere are conflicting reports and controversy7 A+ f3 E5 ?% f' e' Q1 d( f- O
over the effect of early androgen exposure on adult. Q3 l5 O3 O+ K
penile length.10,11 Some reports suggest subnormal2 i: |; M/ j* a
adult penile length, apparently because of downreg-
( M4 F r+ A( i4 [- w; _ulation of androgen receptor number.10,12 However,
( ^! v7 F" {- t+ kSutherland et al13 did not find a correlation between
! `, q6 B/ _+ E. F' Uchildhood testosterone exposure and reduced adult
8 l& j7 n/ e. S# v( |6 Qpenile length in clinical studies.) Z H% p0 Q- r, P0 |( D9 P* e9 X
Nonetheless, we do not believe our patient is
5 b: M9 y# H9 E0 n0 igoing to experience any of the untoward effects from
" T1 {( I+ x8 r/ }. Utestosterone exposure as mentioned earlier because
8 L( y A) i2 o, z6 V* H1 lthe exposure was not for a prolonged period of time.
* G8 k6 J. n$ S" [. L. JAlthough the bone age was advanced at the time of' m( i1 D) ^+ ?0 n; ^# n
diagnosis, the child had a normal growth velocity at6 ? t6 q. V6 \, D5 W
the follow-up visit. It is hoped that his final adult- _ K0 l0 ^8 K
height will not be affected.
6 s. \2 `) _' i6 x6 TAlthough rarely reported, the widespread avail-2 T& r0 {- b8 D/ V
ability of androgen products in our society may
4 ]% q6 `4 A5 p3 ?& {; o* v* F( ]indeed cause more virilization in male or female7 q9 h% ?; I& {# A- G
children than one would realize. Exposure to andro-
" @+ S7 @* X$ z. J- Ygen products must be considered and specific ques-: `4 J0 K; e7 H% x8 ~, D& r
tioning about the use of a testosterone product or
" r; @4 c. A* N* X# Fgel should be asked of the family members during# j& m8 p- T J- e' Z/ w/ `5 T% ^
the evaluation of any children who present with vir-. [2 ]/ i, `5 Z! b, N) @( i$ L
ilization or peripheral precocious puberty. The diag-2 z# K a; m# f' H+ ]
nosis can be established by just a few tests and by
7 l7 Y1 D! T0 i# E: Fappropriate history. The inability to obtain such a
: t( n) o! ~# m" C8 |history, or failure to ask the specific questions, may1 F' k, z4 o3 }2 M3 `
result in extensive, unnecessary, and expensive
% z k s1 y( K/ u. v0 o8 winvestigation. The primary care physician should be2 O) Q& Q7 p2 |0 W2 P& i* V+ q% I( O
aware of this fact, because most of these children
# H7 a8 N5 i% B" a$ lmay initially present in their practice. The Physicians’9 P: S [" E- G* [+ m
Desk Reference and package insert should also put a& B' i# D; q* m- f8 U
warning about the virilizing effect on a male or* K( i# ^) ^: q; x3 g
female child who might come in contact with some-
; A3 ~. |' e, E M f; c' Mone using any of these products.
0 }* L' \1 a2 {& P$ X( }( [5 Z/ QReferences
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" J$ O; a! w. s; l" Z/ f( Jand puberty in the male. In: Sperling MA, ed. Pediatric
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Economics Company, Inc; 2004:3239-3241.
+ G& S2 {7 p8 C# n3 d( J7. Klugo RC, Cerny JC. Response of micropenis to topical
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